2 * Copyright (c) 2019-2020 François Tigeot <ftigeot@wolfpond.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice unmodified, this list of conditions, and the following
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 #include <linux/slab.h>
29 #include <linux/dma-buf.h>
30 #include <linux/dma-fence.h>
31 #include <linux/export.h>
32 #include <linux/module.h>
33 #include <linux/seq_file.h>
34 #include <linux/poll.h>
35 #include <linux/reservation.h>
38 struct dma_buf *dma_buf_export(const struct dma_buf_export_info *exp_info)
40 return ERR_PTR(-EINVAL);
44 dma_buf_map_attachment(struct dma_buf_attachment *attach,
45 enum dma_data_direction direction)
47 struct sg_table *sg_table;
50 return ERR_PTR(-EINVAL);
52 if (attach->dmabuf == NULL)
53 return ERR_PTR(-EINVAL);
55 sg_table = attach->dmabuf->ops->map_dma_buf(attach, direction);
57 return ERR_PTR(-ENOMEM);
62 void dma_buf_unmap_attachment(struct dma_buf_attachment *attach,
63 struct sg_table *sg_table,
64 enum dma_data_direction direction)